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status:1
ids:(1,2,3)
eg.1
UPDATE answer_student SET status=#{status} WHERE studentNumber in #{ids}
UPDATE answer_student SET status="1" WHERE studentNumber in "(1)";
会报错
eg.2
UPDATE answer_student SET status=#{status} WHERE studentNumber in ${ids}
UPDATE answer_student SET status="1" WHERE studentNumber in (1);
但有sql注入问题